[Bug 75719] New: mplayer -vo gl consume more CPU on r200

[Bug 75719] New: mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

          Priority: medium
            Bug ID: 75719
          Assignee: dri-devel@lists.freedesktop.org
           Summary: mplayer -vo gl consume more CPU on r200
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: smoki00790@gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

OS is current Debian Sid 32bit, card 1002:5960...

  So this is on r200 i spotted playing any video file vith gl render (but also
many videos in games are also affected), bisecting says it started with this
code in ttm:


http://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-next&id=a095c60bd06f204c98527aafd5fda6ef42b53eb5

 And it performs the same also in 3.14-rc5 kernel :). It consume cca 40% or
more CPU power after that commit... that *more* depends on video file and if it
is in game or playing video file with mplayer -vo gl.

  Mesa version seems doesn't metter i tried 9.2 git, 10.0 git, 10.1 git and
current git master.

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #1 from smoki <smoki00790@gmail.com> ---
Created attachment 95043
  --> https://bugs.freedesktop.org/attachment.cgi?id=95043&action=edit
dmesg

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #2 from smoki <smoki00790@gmail.com> ---
Created attachment 95046
  --> https://bugs.freedesktop.org/attachment.cgi?id=95046&action=edit
glxinfo

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #3 from smoki <smoki00790@gmail.com> ---
Created attachment 95047
  --> https://bugs.freedesktop.org/attachment.cgi?id=95047&action=edit
Xorg.0.log

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #4 from smoki <smoki00790@gmail.com> ---

 Disable or enable ColorTiling doesn't help it is the same plus 40% CPU usage.

 In both cases even it used more CPU for gl video playback it is not smooth
anymore.

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #5 from smoki <smoki00790@gmail.com> ---
Created attachment 95050
  --> https://bugs.freedesktop.org/attachment.cgi?id=95050&action=edit
Before commit


 Example from games when video is there: main menu from OpenJK game
https://github.com/JACoders/OpenJK . In the centar circle there is playing a
video file.

 CPU usage is 50% and it have ~50 FPS

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #6 from smoki <smoki00790@gmail.com> ---
Created attachment 95051
  --> https://bugs.freedesktop.org/attachment.cgi?id=95051&action=edit
With this commit


 With this commit:

 CPU usage is higher 90% but it have just ~12 FPS :).

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #7 from smoki <smoki00790@gmail.com> ---

 So in this case it uses 700 MHz more CPU power, but gives nothing FPS :).

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #8 from Thomas Hellström <thellstrom@vmware.com> ---
There's really nothing in this commit that should affect anything but metadata,
and if anything, CPU usage should've decreased.

So if CPU usage is drastically increased by this commit (or rather this merge),
IMHO that points to a bug somewhere else, but triggered by this merge; possibly
in radeon / TTM caching setup or in the x86 PAT memory region tracking code.

In any case, I'm on out-of-office this week and can't look at this before next
week, but meantime it would be helpful if you could perform a couple of
additional checks:

1) Try to find out which of the commits in the merge that causes this. If that
turns out to be hard, could you change all occurencies of VM_PFNMAP in
ttm_bo_mmap() (ttm_bo_vm.c) to VM_MIXEDMAP and check if that fixes the problem
you are seeing?

2) If you're familiar with oprofile, it would be very helpful to see a profile
of a "good" and a "bad" run, including kernel symbols.

Thanks,

/Thomas

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #9 from smoki <smoki00790@gmail.com> ---
(In reply to comment #8)
> could you change all occurencies of VM_PFNMAP in
> ttm_bo_mmap() (ttm_bo_vm.c) to VM_MIXEDMAP and check if that fixes the
> problem you are seeing?

 Quick try and yes that helps :). Seems like r200 like VM_MIXEDMAP, but not
VM_PFNMAP.

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #10 from smoki <smoki00790@gmail.com> ---

 One thing to point out which is rather strange to me, but maybe that can help
someone to figured out what is this... GL games rendering and CPU usage in them
are normal and not affected by this bug!!! but ONLY gl video playback triggers
this both with players or in games.

 So two thing are in this combination: VM_PFNMAP and GL videos doesn't play
well together on r200 :).

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #11 from smoki <smoki00790@gmail.com> ---
 I am not in this but... could it be that videos played with gl are also some
kind of special case which maybe? needs COW thus need MIXEDMAP or something
like that? :)

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #12 from smoki <smoki00790@gmail.com> ---
Created attachment 95181
  --> https://bugs.freedesktop.org/attachment.cgi?id=95181&action=edit
BAD: 3.14-rc5 and VM_PFNMAP

(In reply to comment #8)
> 
> 2) If you're familiar with oprofile, it would be very helpful to see a
> profile of a "good" and a "bad" run, including kernel symbols.
>

 Not very familiar but to give it a try :). This is 3.14-rc5 proper kernel with
pfnmap which is bad case here and then oprofiled with pfnmap changed to
mixedmap which is good one :).

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #13 from smoki <smoki00790@gmail.com> ---
Created attachment 95182
  --> https://bugs.freedesktop.org/attachment.cgi?id=95182&action=edit
GOOD: 3.14-rc5 and VM_MIXEDMAP

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #14 from smoki <smoki00790@gmail.com> ---
(In reply to comment #8)
> So if CPU usage is drastically increased by this commit (or rather this
> merge), IMHO that points to a bug somewhere else, but triggered by this
> merge; possibly in radeon / TTM caching setup or in the x86 PAT memory
> region tracking code.
> 

 Seems like that is the case... VM_PFNMAP usage instead of VM_MIXEDMAP triggers
that i now need 'nopat' boot option it is also workaround...  

 So only 'nopat' option work here good with VM_PFNMAP or like before
VM_MIXEDMAP is good with PAT... VM_PFNMAP with PAT here is really unusable for
gl videos :).

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #15 from Thomas Hellström <thellstrom@vmware.com> ---
(In reply to comment #14)
> (In reply to comment #8)
> > So if CPU usage is drastically increased by this commit (or rather this
> > merge), IMHO that points to a bug somewhere else, but triggered by this
> > merge; possibly in radeon / TTM caching setup or in the x86 PAT memory
> > region tracking code.
> > 
> 
>  Seems like that is the case... VM_PFNMAP usage instead of VM_MIXEDMAP
> triggers that i now need 'nopat' boot option it is also workaround...  
> 
>  So only 'nopat' option work here good with VM_PFNMAP or like before
> VM_MIXEDMAP is good with PAT... VM_PFNMAP with PAT here is really unusable
> for gl videos :).


Interesting, although it's not the first time x86 pat/caching has busted
graphics performance-wise, which might appear a bit strange considering
graphics is a major user.

In any case, I'll put together a patch to revert the VM_PFNMAP usage until I've
figured out what's really happening (it's only there to boost performance
anyway).

Meanwhile, the fact that this is visible also points to an area of potential
improvement in the radeon driver. Apparently video playback causes a lot of
buffer maps / unmaps. Could the maps somehow be cached in the driver?

Thanks,
Thomas

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[Bug 75719] mplayer -vo gl consume more CPU on r200

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https://bugs.freedesktop.org/show_bug.cgi?id=75719

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #16 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/455.

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